Charging method and mobile terminal

• US 10,283,993 B2
• Filed: 11/20/2018
• Issued: 05/07/2019
• Est. Priority Date: 12/03/2015
• Status: Active Grant

• Current Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Original Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Inventors: Deng, Nanwei
• Primary Examiner(s): Berhanu, Samuel
• Application Number:
  US16/196,436
• Publication Number:
  US 20190089166A1
• Time in Patent Office: 168 Days
• Field of Search: 320160
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0071 with a programmable schedule

Abstract

A charging method and a mobile terminal are provided. The method includes the following. An initial cut-off voltage and an initial charging current of a battery are set when the battery is subjected to constant current charging. The initial cut-off voltage is greater than a safe cut-off voltage of the battery. A battery voltage of the battery is detected. Whether the current battery voltage is equal to the initial cut-off voltage is determined. The initial cut-off voltage and the initial charging current are gradually decreased when the current battery voltage is equal to the initial cut-off voltage, until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and the battery is charged in constant voltage charging when the current battery voltage is equal to the safe cut-off voltage, where a voltage of the constant voltage charging is the safe cut-off voltage.

Claims

1. A charging method, comprising:

setting an initial cut-off voltage and an initial charging current of a battery when the battery is subjected to constant current charging, the initial cut-off voltage being greater than a safe cut-off voltage of the battery, and a difference between the initial cut-off voltage and the safe cut-off voltage being less than or equal to a preset voltage difference;

detecting a battery voltage of the battery, the battery voltage being a sum of a real voltage of the battery and a voltage of an inner resistor of the battery;

determining whether the current battery voltage is equal to the initial cut-off voltage; and

decreasing the initial cut-off voltage and the initial charging current gradually based on a determination that the current battery voltage is equal to the initial cut-off voltage, until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and charging the battery in constant voltage charging when the current battery voltage is equal to the safe cut-off voltage, a voltage of the constant voltage charging being the safe cut-off voltage.

2. The method of claim 1, wherein decreasing the initial cut-off voltage and the initial charging current gradually until the initial cut-off voltage is less than or equal to the safe cut-off voltage and charging the battery in constant voltage charging comprises:

decreasing the initial cut-off voltage by a first preset value to function as a current cut-off voltage and decreasing the initial charging current by a second preset value to function as a current charging current;

determining whether the current cut-off voltage is greater than the safe cut-off voltage;

determining whether the current battery voltage is equal to the current cut-off voltage based on a determination that the current cut-off voltage is greater than the safe cut-off voltage;

decreasing the current cut-off voltage by the first preset value to function as a new current cut-off voltage and decreasing the current charging current by the second preset value to function as a new current charging current based on a determination that the current battery voltage is equal to the current cut-off voltage;

determining whether the current cut-off voltage is greater than the safe cut-off voltage until the current cut-off voltage is less than or equal to the safe cut-off voltage; and

charging the battery in the constant voltage charging when the current cut-off voltage is less than or equal to the safe cut-off voltage.

3. The method of claim 1, further comprising:

determining whether the current battery voltage is equal to the initial cut-off voltage continuously based on a determination that the current battery voltage is unequal to the initial cut-off voltage.

4. The method of claim 2, wherein the difference between the initial cut-off voltage and the safe cut-off voltage is K times of the first preset value, and K is a positive integer.

5. The method of claim 1, wherein setting the initial cut-off voltage and the initial charging current of the battery comprises:

detecting the safe cut-off voltage of the battery;

setting the initial cut-off voltage of the battery according to a mapping relationship between the safe cut-off voltage and the initial cut-off voltage; and

setting the initial charging current of the battery according to a mapping relationship between the initial cut-off voltage and the initial charging current.

6. The method of claim 2, wherein setting the initial cut-off voltage and the initial charging current of the battery comprises:

detecting the safe cut-off voltage of the battery;

setting the initial cut-off voltage of the battery according to a mapping relationship between the safe cut-off voltage and the initial cut-off voltage; and

setting the initial charging current of the battery according to a mapping relationship between the initial cut-off voltage and the initial charging current.

7. The method of claim 3, wherein setting the initial cut-off voltage and the initial charging current of the battery comprises:

detecting the safe cut-off voltage of the battery;

setting the initial cut-off voltage of the battery according to a mapping relationship between the safe cut-off voltage and the initial cut-off voltage; and

setting the initial charging current of the battery according to a mapping relationship between the initial cut-off voltage and the initial charging current.

8. The method of claim 4, wherein setting the initial cut-off voltage and the initial charging current of the battery comprises:

detecting the safe cut-off voltage of the battery;

setting the initial cut-off voltage of the battery according to a mapping relationship between the safe cut-off voltage and the initial cut-off voltage; and

setting the initial charging current of the battery according to a mapping relationship between the initial cut-off voltage and the initial charging current.

9. A mobile terminal, comprising:

a setting unit, configured to set an initial cut-off voltage and an initial charging current of a battery when the battery is subjected to constant current charging, wherein the initial cut-off voltage is greater than a safe cut-off voltage of the battery, and a difference between the initial cut-off voltage and the safe cut-off voltage is less than or equal to a preset voltage difference;

a detecting unit, configured to detect a battery voltage of the battery, wherein the battery voltage is a sum of a real voltage of the battery and a voltage of an inner resistor of the battery;

a determining unit, configured to determine whether the current battery voltage is equal to the initial cut-off voltage; and

an adjusting unit, configured to decrease the initial cut-off voltage and the initial charging current gradually when the determining unit determines that the current battery voltage is equal to the initial cut-off voltage, until the initial cut-off voltage is less than or equal to the safe cut-off voltage, and to charge the battery in constant voltage charging when the current battery voltage is equal to the safe cut-off voltage, wherein a voltage of the constant voltage charging is the safe cut-off voltage.

10. The mobile terminal of claim 9, wherein the adjusting unit comprises:

a first adjusting sub-unit, configured to decrease the initial cut-off voltage by a first preset value to function as a current cut-off voltage, and to decrease the initial charging current by a second preset value to function as a current charging current;

a first determining sub-unit, configured to determine whether the current cut-off voltage is greater than the safe cut-off voltage;

a second determining sub-unit, configured to determine whether the current battery voltage is equal to the current cut-off voltage when the first determining sub-unit determines that the current cut-off voltage is greater than the safe cut-off voltage; and

a second adjusting sub-unit, configured to decrease the current cut-off voltage by the first preset value to function as a new current cut-off voltage and to decrease the current charging current by the second preset value to function as a new current charging current when the second determining sub-unit determines that the current battery voltage is equal to the current cut-off voltage, to trigger the first determining sub-unit to determine whether the current cut-off voltage is greater than the safe cut-off voltage until the first determining sub-unit determines that the current cut-off voltage is less than or equal to the safe cut-off voltage, and to charge the battery in the constant voltage charging when the first determining sub-unit determines that the current cut-off voltage is less than or equal to the safe cut-off voltage.

11. The mobile terminal of claim 9, wherein the determining unit is configured to determine whether the current battery voltage is equal to the initial cut-off voltage continuously when the determining unit determines that the current battery voltage is unequal to the initial cut-off voltage.

12. The mobile terminal of claim 10, wherein the difference between the initial cut-off voltage and the safe cut-off voltage is K times of the first preset value, and K is a positive integer.

13. The mobile terminal of claim 9, wherein the setting unit comprises:

a detecting sub-unit, configured to detect the safe cut-off voltage of the battery;

a setting sub-unit, configured to set the initial cut-off voltage of the battery according to a mapping relationship between the safe cut-off voltage and the initial cut-off voltage; and

the setting sub-unit being further configured to set the initial charging current of the battery according to a mapping relationship between the initial cut-off voltage and the initial charging current.

14. The mobile terminal of claim 10, wherein the setting unit comprises:

a detecting sub-unit, configured to detect the safe cut-off voltage of the battery;

a setting sub-unit, configured to set the initial cut-off voltage of the battery according to a mapping relationship between the safe cut-off voltage and the initial cut-off voltage; and

the setting sub-unit being further configured to set the initial charging current of the battery according to a mapping relationship between the initial cut-off voltage and the initial charging current.

15. The mobile terminal of claim 11, wherein the setting unit comprises:

a detecting sub-unit, configured to detect the safe cut-off voltage of the battery;

a setting sub-unit, configured to set the initial cut-off voltage of the battery according to a mapping relationship between the safe cut-off voltage and the initial cut-off voltage; and

the setting sub-unit being further configured to set the initial charging current of the battery according to a mapping relationship between the initial cut-off voltage and the initial charging current.

16. The mobile terminal of claim 12, wherein the setting unit comprises:

a detecting sub-unit, configured to detect the safe cut-off voltage of the battery;

a setting sub-unit, configured to set the initial cut-off voltage of the battery according to a mapping relationship between the safe cut-off voltage and the initial cut-off voltage; and

the setting sub-unit being further configured to set the initial charging current of the battery according to a mapping relationship between the initial cut-off voltage and the initial charging current.